What is wh?

Some articles on wh:

Pouto Peninsula - History
... In the late 17th century, or early 18th, Ngāti Whātua occupied the Pouto Peninsula as part of their move southwards ... Wars, Ngā Puhi laid siege to Ngāti Whātua's Tauhara pa near Pouto, but were unable to capture it ... by the marriage of a Ngā Puhi chief to the daughter of a Ngāti Whātua chief ...
Heathkit H8 - History - H8
... To be useful, the user also need to purchase a 4 kB SRAM card ($139) and some form of storage controller at a minimum this would be the H10 paper tape punch/reader or the H8-5 Serial I/O card ($110) which controlled a cassette tape, using a 1200-baud variant of the Kansas City standard format ... Another common accessory was the H9 video terminal, which was also driven by the H8-5 card although any serial terminal would work ...
Central Atlas Tamazight - Grammar - Syntax
... wh- questions are always clefts, and multiple wh-questions do not occur ... Consequently Tamazight's clefting, relativisation, and wh-interrogation contribute to anti-agreement effects, similar to Shilha, and causes deletion of the verbal person ...