Can only speak of metric but I use 2mm, 3.5mm, 5mm, 7mm,10mm text sizes… all uppercase and Arial… keep it simple for universal compatability…
(Reflects my rotring technical pen and letter stencil days)
PS… there is no consistent measure for text height… its a chaotic historical mess two fonts with the same pt size can visually vary dramatically
Oh, and I always use Unicode fonts - Avoids issues when translating