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

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.

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.