International standards for size and model help ensure consistency, compatibility, and interoperability across industries, products, and services worldwide. Below are key standards related to sizing and modeling in different sectors.

ISO 3635 (Size designation of clothes) – Defines standard body measurements for clothing sizes.
ISO 9407 (Shoe sizes) – Based on the Mondopoint system (foot length in millimeters).
EN 13402 (European clothing sizes) – Uses body measurements (chest, waist, height).
US, UK, EU, JP, GB sizing systems – Different regions use their own standards (e.g., US men’s shoe size vs. EU shoe size).

ISO Metric Screw Threads (ISO 68-1, ISO 261) – Standardizes screw and bolt sizes.
ANSI/ASME B36.10 (Pipe sizes) – Standard dimensions for pipes in the US.
DIN (German Institute for Standardization) – Used for industrial components in Europe.
IEC 60027 (Letter symbols for electrical engineering) – Standardizes component models.

USB, HDMI, Lightning (IEEE, USB-IF standards) – Standardized ports and connectors.
SIM Card Sizes (Mini, Micro, Nano – ETSI TS 102 221) – Defined by telecom standards.
Paper Sizes (ISO 216 – A4, A3, etc.) – Used globally except in North America (where US Letter is common).

Tire Sizes (ISO 4000, ETRTO) – Standardized markings (e.g., 205/55R16).
Vehicle Identification Number (VIN – ISO 3779) – Unique model and manufacturer codes.
OBD-II (SAE J1962, ISO 15031) – Standardized car diagnostic ports.

Modular Coordination (ISO 1803) – Standardizes building component dimensions.
Brick Sizes (ISO 6707-1) – Varies by region (e.g., UK vs. US bricks).
Door and Window Sizes (EN 12519, ANSI A250.3) – Standardized dimensions.

Pallet Sizes (ISO 6780) – Standard Euro pallet (1200×800 mm) vs. US pallet (48×40 inches).
Bottle/Container Threads (ISO 9000, ANSI B16.5) – For caps and closures.
Food Portion Sizes (EU No. 1169/2011, FDA guidelines) – Nutritional labeling standards.

STEP (ISO 10303) – Standard for 3D model data exchange.
OBJ, STL (De facto standards for 3D printing) – Widely used in additive manufacturing.
Unicode (ISO/IEC 10646) – Standardizes text and symbols across digital platforms.

Key Organizations Setting Size & Model Standards:
ISO (International Organization for Standardization) – Global standards.
ANSI (American National Standards Institute) – US standards.
DIN (Germany), BSI (UK), JIS (Japan) – Regional standards.
IEEE, IEC, SAE – Industry-specific standards.