A3+ Paper, also referenced as Super A3, is not part of the A paper series and is does not follow the ISO 216 international paper size standard. The plus sign within the name signifies an extension of the paper size, A3 Paper, that is mainly used for large format printing.
A Paper Sizes A1,A2,A3,A4,A5 Paper Size Guide: A1, A2, A3, A4, and A5 Explained A Comprehensive Guide to A1, A2, A3, A4, and A5 Sizes - Norway
What is A3 Paper Size: Understanding the Dimensions and Comparison with Other Paper Sizes - Quill And Fox
Paper Size Guide - A0, A1, A2, A3, A4, A5, A6
Pin on Graphic Design
Mancloem A3 White Cartridge Sheets - 150 GSM, Ideal for Sketching, Drawing, School Assignments and Office Work, 16.5 x 11.5 inches
Technical Drawing Sheet Size
A3 Size - Paper, Frame, Print (mm, cm, inch) - Mainthebest
A3 paper dimensions. Free infographic of the ISO A3 paper size.
A3 Paper Size Dimensions, A Paper Sizes
Paper Sizes
Paper Sizes A1 A0 A2 A3
Paper Size Guide: A3+ & A4+
A4 paper format / International standard paper sizes
Paper Drafting Sizes - ISO 216 series A, B and C