The term used to refer to all ranks below officers is "other ranks" (abbreviated "ORs"). It includes warrant officers, non-commissioned officers ("NCOs") and ordinary soldiers with the rank of private or regimental equivalent. Officers may, in speaking, distinguish themselves from those "in the ranks".
Royal Artillery other ranks include Gunner instead of Private, and Lance Bombardier and Bombardier instead of Lance Corporal and Corporal.
In the Foot Guards and Honourable Artillery Company:
The Household Cavalry maintains the old cavalry tradition of having no rank of sergeant, which was originally an infantry rank only. This is allegedly because the word "sergeant" is descended from "servant" and such a title was considered inappropriate for Household troops. It has its own peculiar set of insignia and ranks with the following equivalents:
Similarly, warrant officer appointments are different, with, for example, "regimental corporal major" being used in place of regimental sergeant major.
Uniquely, non-commissioned officers and warrant officers of the Household Cavalry do not wear any insignia on their full dress uniforms (although officers do). Rank is indicated by a system of aiguillettes.
In several cavalry regiments including the 1st The Queen's Dragoon Guards and the Queen's Royal Hussars, NCOs holding the rank of lance corporal wear two stripes. Full corporals are distinguished by the addition of a cypher above their two stripes in dress uniforms.
Staff sergeants in an appointment as squadron quartermaster sergeant in the cavalry, sometimes wear four stripes with a crown and are referred to as "sergeant major". The term "mister" is confined to WO2s.
The chevrons worn by many non-commissioned officers are based on heraldic devices and their current use for NCOs originates from the time of the Napoleonic Wars in 1802. As today, sergeants wore three chevrons, point downwards, on the upper arm, and corporals wore two, with sergeant-majors and quarter-master-sergeants then having four. Lance corporal, at the time not a rank but an appointment historically known as chosen man and carrying extra pay for privates holding it, were given a single chevron a few years later, and later in the century the lance-sergeant appeared, wearing three chevrons. The infantry rank of colour sergeant was created in 1813 as a reward for senior sergeants with one allowed per company. He was allowed to wear a badge consisting of a regimental colour supported by two crossed swords.