totally useful.
http://www.gsa.gov/gsa/cm_attachments/GSA_DOCUMENT/CAD_standards_R2NY1-k_0Z5RDZ-i34K-pR.pdf
There is this table on page 17 which looks like other
numbering systems I've seen:
Sheet Type Designators
0 General (symbols, legends, notes, etc.)
1 Plans (horizontal views)
2 Elevations (vertical views)
3 Sections (sectional views)
4 Large Scale Views (plans, elevations, or sections
that are not details)
5 Details
6 Schedules and Diagrams
7 User Defined
8 User Defined
9 3D Representations (isometrics, perspectives,
photographs)
HTH
Mark Johnson PE
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