Although "ho" was originally the adult male form, the children equivalent being nin, "ho" is now used extensively for either, without taking into account the receptor's gender or age, while "nin" has largely retained its connotations.
HO definition: (used as a call to attract attention, sometimes specially used after a word denoting a destination). See examples of ho used in a sentence.
HO or H0 is a rail transport modelling scale using a 1:87 scale (3.5 mm to 1 foot). It is the most popular scale of model railway in the world. [1][2] The rails are spaced 16.5 millimetres (0.650 in) apart for modelling 1,435 mm (4 ft 81⁄2 in) standard gauge tracks and trains in HO.
As an interjection, "ho" is an exclamation often used to grab attention, express surprise, or denote enthusiasm. It appears frequently in older literature or traditional expressions. In anthropological contexts, "ho" refers to members of the Ho ethnic group, predominantly found in India.
Factsheet What does the word ho mean? There are eight meanings listed in OED's entry for the word ho. See ‘Meaning & use’ for definitions, usage, and quotation evidence.