The Apple Watch typeface (previously) is called San Francisco and comes in two optical sizes (≤19 pt and ≥20 pt). Typography in general has eight predefined styles, one of which is (recursively) called Custom Font.
Looks like it was renamed. Previous version (2014 Feb) was galled GizmoMicro, it was a 10 weights family (plus 4 optical sizes for the Regular and the Bold)
I'm sure it's still true, but questionable how much difference it makes rendering TrueType fonts using modern microprocessors. Remember that they needed to get acceptable on-the-fly rendering of outline fonts on the 8 mhz processor of the Mac Plus when TrueType debuted.
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