5.2.9 Character dimensions. The alphanumeric character
dimensions and spacing shall be selected for speed and accuracy of
interpretation and shall be in accordance with MIL-STD-1472. The height of
symbols and characters shall subtend a viewing angle of no less than 20
minutes of arc when measured from the design eye position (see 3.8). Character dimensions and fonts
shall be evaluated and approved by the acquiring activity before
implementation (see 6.3.1).