(historical) Initialism of Irish Republican Brotherhood, a secret organisation dedicated to the establishment of an independent democratic republic in Ireland between 1858 and 1924.

plural of Strelitz

(mathematics) A type of vector field defined on an open set of such that every vector in the field is tangent to the corresponding point in the set.

A turn made by a vehicle across all lanes of traffic, sometimes used to improve the flow of through traffic or to keep the middle of the road free for trams etc.