Chú thích ISO 31-11

  1. ↑ If the perpendicular symbol, &#x27C2h;, does not display correctly, it is similar to &#x22A5h; (up tack: sometimes meaning orthogonal to) and it also appears similar to &#x23CAh; (the dentistry: symbol light up and horizontal)
Các tiêu chuẩn ISO
1–9999
10000–19999
20000+