hecto

The next small but significant technological step after hecto is the spirit duplicator, essentially the hectography process using a drum instead of the gelatin.

Hecto used an aniline dye, transferred to a tray of gelatin, and paper would be placed on the gel, one sheet at a time, for transfer.

Meteorologists also use another seldom encountered SI prefix: hecto- in hectopascal (hPa).

Today many meteorologists prefer hectopascals (hPa) for air pressure, which are equivalent to millibars, while similar pressures are given in kilopascals in practically all other fields, since the hecto prefix is rarely used.