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1. Mountaineering any of various devices such as piton or nut when used as a direct help in the ascent
2. (in medieval Europe; in England after 1066) a feudal payment made to the king or any lord by his vassals, usually on certain occasions such as the marriage of a daughter or the knighting of an eldest son


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The semistructured interviews were based on the D-Quest (Wessels & de Witte, 2003), combined with open questions concerning the participants' subjective experiences, and opinions about the use and functionality of the electronic travel aids.
During the past two decades, there has been an increase in research on and the development of electronic travel aids to assist people who are visually impaired with navigation.

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