By definition, 1 is the magnitude, absolute value, or norm of a unit complex number, unit vector, and a unit matrix (more usually called an identity matrix).
Dǎɣ aliɣi, 1 eqal magnitude, ən valeur absolue meɣ uqud ən amaɗin aśohen ən unitaire, ən ɣeəteur unitaire əd matriəe unitaire (ogaran deɣqanen sitawana matrice atiwazayan).