H Hecto (prefix) 10² = 100

H Henry

H Hour / Heure (1 hour = 60 minutes = 3600 seconds)

h Hecto (prefix) 10²

Hectare Hectare

ha Hectare (1 hectare = 100 ares = 10,000 square meters = 2.471 acres)

Hectoliter Hectolitre

hl Hectolitre / Hectoliter (1 hectoliter = 100 liters = 0.1 cubic meter = 26.4172 gallons)

HLS Hue, Lightness, Saturation

hm Hectomètre

hp Horse Power / Cheval vapeur

HP High Pressure

hp-h Horsepower hour

HS Harmonized System / Harmonized Commodity Description and Coding System adopted in January of 1989 by the United States (an international standardized tariff nomenclature of the WCO World Customs Organization)

HT Haute tension

Hz Hertz (cycles/second)