This glossary explains the terms that come up when you measure vehicle fit and finish on the line, and when you count cartons at the dock or bins in the rack. Each entry is two or three sentences, with a source link where the definition is not common knowledge.
It is written for quality and process engineers in Indian auto plants and for warehouse, 3PL and FMCG distribution teams. Terms are grouped by topic and listed alphabetically within each group.
Vehicle fit and finish
Body in white (BIW)
The stage at which a car body’s sheet metal parts have been welded together, before painting and before moving parts are added (Kallanish glossary). Many fit problems start here, which is why plants measure the BIW as well as the finished car.
Class-A surface
A visible, styled surface whose quality is judged by how it reflects light, such as an outer door or bonnet skin. Strictly it needs smooth tangency and curvature, and many people take it to mean G2 or even G3 continuity (Wikipedia). Class-A surfaces are where customers notice waviness and misaligned edges first.
Closures
The hinged or opening panels of a body: doors, hood, tailgate and fuel lid. Gap and flush checks focus on “the exterior panels and closures” because their fit varies with hinge setting and hanging (Nikon Metrology).
Customer product audit (CPA)
A sample-based check of finished vehicles from the customer’s point of view, usually done after the end of line. The VDA 6.5 product audit standard describes this as a systematic, sample-based verification of finished products against all specified requirements (Mobile2b on VDA 6.5). Final vehicle audits typically turn auditors’ judgements into a quantitative score for tracking (Coventry University).
Datum and PLP
A datum is a defined reference feature that fixes a part’s position for measurement. A reference point system uses datum points that constrain all six degrees of freedom, often following the 3-2-1 rule (AT Sensors). Some OEMs call them principal locating points (PLP), a term also written “principle locating points” (Skill-Lync).
Flush
The height difference between two neighbouring panel surfaces across a seam, measured at right angles to the surface. A positive or negative flush shows as one panel standing proud of or sitting below the other, which people can feel with their fingers (Nikon Metrology). The DeepVision Tunnel page uses 0 +/- 1.0 mm as an illustrative flush tolerance.
Gap
The width of the opening between two adjacent panels, such as door to fender, measured across the seam in millimetres. Gaps are among the first things a customer notices, even before getting into the car (Nikon Metrology). The DeepVision Tunnel page uses 4.0 +/- 0.7 mm as an illustrative gap tolerance.
Gauge R&R
A study of how much of your measurement variation comes from the gauge itself (repeatability) and from operators or other factors (reproducibility). Several sources, including the AIAG manual, treat a result under 10% as acceptable and over 30% as unacceptable, with the range between depending on cost and risk (iSixSigma). Run one before you trust any new gap and flush system.
IQS (Initial Quality Study)
A J.D. Power survey of new-vehicle owners that counts problems experienced early in ownership, reported in PP100. The U.S. study covers the first 90 days (Motor1 on the 2026 U.S. IQS); the India study covers owners from their first month up to six months (J.D. Power, 2023 India IQS).
Laser triangulation
A measuring method in which a laser spot or line is projected onto a surface and a sensor set at an angle sees where the reflection lands. The position of the light on the sensor gives the distance (Micro-Epsilon). Sweeping a laser line across a seam gives a height profile from which gap and flush can be read.
Parallelism
How evenly a gap runs along its length, for example whether a door-to-fender gap is the same width at the top and bottom. The human eye quickly sees whether lines are parallel (Nikon Metrology), so a tapering gap can look worse than a uniformly wide one.
PDI (pre-delivery inspection)
The final check of a new car before it is handed over to the buyer, done by the dealer and often by the buyer too. Indian PDI checklists include looking for uneven panel gaps, scratches, dents and repaint marks (Autocar India).
Perceived quality
The quality a customer judges from what they see and touch, rather than from measured function. Small details such as panel gaps can affect how people perceive the quality of the vehicle and the brand (Nikon Metrology).
Point cloud
A set of data points in a three-dimensional coordinate system, each with X, Y and Z position and sometimes colour or brightness (Autodesk). 3D cameras and scanners produce point clouds, and software extracts seam edges and surfaces from them.
PP100
Problems per 100 vehicles, the unit J.D. Power uses for quality studies. A lower score means higher quality (Motor1).
Structured light
A 3D measuring method that projects a coded light pattern onto a surface and images it with a camera. The pattern labels points in the scene, and their 3D coordinates are recovered by triangulation (University of Twente ITC). One capture covers an area rather than a single line.
TCF (trim, chassis, final)
The assembly area that follows the body shop and paint shop. Painted bodies enter, the remaining parts and subassemblies are fitted, and finished cars drive off the end of the line (MHI case study). Gap and flush measured here reflect what the customer will see.
Warehouse and dispatch
3PL (third-party logistics)
A provider that offers outsourced logistics services such as warehousing, transport and fulfilment (TechTarget). A 3PL warehouse often holds stock for several clients, so counts must be kept by client.
ASN (advance shipping notice)
A notice of an upcoming delivery, usually sent electronically, so the receiver can prepare to receive the goods (TrueCommerce). An inbound tally can be run against the ASN or purchase order.
Bin
The smallest addressable storage location in a rack, such as one shelf position or pallet slot. Each bin carries a location label so that stock can be put away and found again.
Carton code
The product or batch code printed on a shipping carton, often alongside a barcode. At the dock, the carton code is what you tally against the order lines.
Cycle count
Counting small portions of stock frequently through the year instead of everything at once. It runs alongside normal work, while a full count usually needs operations to pause (ERP Research).
Dock tally
Counting cartons as they are loaded onto or unloaded from a truck and comparing them with the shipment list. It catches short and excess cartons before the truck leaves or the GRN is signed.
E-way bill
An electronic document generated on the GST portal before goods move. A registered person moving goods worth more than Rs 50,000 must generate one (GST Council).
Excess
Cartons loaded or received over the quantity on the order or invoice. Excess at dispatch is stock given away; excess at receipt needs a decision to accept or return.
GRN (goods received note)
A formal document issued by stores or procurement after receiving goods from a supplier. Accounts then match the supplier invoice against the purchase order and GRN, a “three-way match” (Tally Solutions).
Godown
The common Indian word for a warehouse or storeroom. It is used for everything from a small distributor’s store to a large depot.
Inward and outward
Inward is goods coming into the warehouse (receiving); outward is goods going out (dispatch). Each has its own register, documents and tally.
LPN (licence plate number)
A unique identifier given to a specific grouping of inventory, such as a pallet or tote, inside a warehouse (Hopstack). Scanning the LPN tells the WMS everything on that unit at once.
Physical verification
Counting stock on hand and comparing it with the books. Under CARO 2020 the statutory auditor reports on whether its coverage and procedure are appropriate and on discrepancies of 10% or more in aggregate for each class of inventory (BCAJ).
POD (proof of delivery)
A document that gives evidence of successful delivery of goods from the shipper to the consignee (Motive). In India it is often a signed and stamped copy of the invoice or lorry receipt (LR).
Proof of loading
Evidence of exactly what went onto the truck, such as a signed loading tally, photos or a scan log. It helps settle claims when the customer’s count does not match the POD.
Short shipment
A dispatch or delivery with fewer cartons than ordered or invoiced. Catching it at the dock costs less than a customer claim later.
SKU (stock keeping unit)
A code for one distinct product variant, such as a given pack size or flavour. Stock, orders and counts are all tracked by SKU.
Tally sheet
The paper or spreadsheet form on which a loader or checker marks cartons as they are counted. It is the traditional record of a dock tally or manual stock count.
Truck utilisation
How much of a truck’s capacity is used, by volume or by weight. Higher utilisation means fewer trips for the same cargo.
WMS (warehouse management system)
Software and processes that let an organisation control and manage warehouse operations, from receiving to dispatch (TechTarget). Cycle counts and dock tallies are reconciled against the WMS.
Where Indus Vision products fit
Indus Vision, Bengaluru, builds two products that use these terms. DeepVision Tunnel is a drive-through 3D measurement arch for final assembly: structured-light 3D cameras read each panel seam as the vehicle passes on the conveyor, and DeepMeasure software computes gap, flush and parallelism against the vehicle ID, with no stop and no fixture. DeepVision Warehouse covers dock tally, reading each carton’s printed code and barcode against the shipment in real time, and rack audit, reading bin labels and counting boxes from a camera rig moved along the aisle.