Indeed USA deviates from ICAO:
22.214.171.124 Zeros are not used to precede single-digit runway markings. An optional configuration of the numeral 1 is available to designate a runway 1 and to prevent confusion with the runway centerline.
Source: USA AIP - GEN 1.7 Differences From ICAO SARPs
126.96.36.199 in ICAO SARPs Annex 14 (Aerodromes) is as follows (emphasis mine)...
The textual description says clearly:
RWY track to 4.5 DME FFM/1.5 DME FRD or 800, whichever is later
The equivalent encoding is:
[A800+] - DF134 (25C)[L] / DF135 (25L)[L]
The meaning of this is climb to an altitude of 800ft or above, then after passing DF134/DF135 turn left.
From this EUROCONTROL document (Guidance Material for the Design of ...