This part of ISO 14405 establishes the default specification operator for angular size and defines a number of special specification operators for features of size with angular size: cone, frustum (truncated or not), wedge (truncated or not), two opposite straight lines (intersection of a wedge/truncated wedge and a plane perpendicular to the median plane of the wedge/truncated wedge, intersection of a cone/frustum and a plane containing the axis of revolution of the cone/frustum). See Figures 1 and 2. This part of ISO 14405 also defines the specification modifiers and the drawing indications for these angular sizes. This part of ISO 14405 covers the following angular sizes. ¾ð Local angular size; ¾ð Angular size between two lines; ¾ð Portion angular size. ¾ð Global angular size; ¾ð Direct global angular size; ¾ð Least squares angular size; ¾ð Minimax angular size. ¾ð Rank order angular size /indirect global angular size; ¾ð Maximum angular size; ¾ð Minimum angular size; ¾ð Average angular size; ¾ð Range of angular size; ¾ð Mid range angular size; ¾ð Median angular size; ¾ð Standard deviation of angular size. This part of ISO 14405 defines the meaning of tolerances of angular sizes indicated as: ¾ð + and/or limit deviations, e.g. 0°/-0,5°, or; ¾ð indicated with upper limit of size (ULS) and/or lower limit of size (LLS), e.g., 35° max. or 15° min., 34°/36°; ¾ð with or without modifiers. This standard gives a set of tools, to express several types of angular size characteristic. It does not give any information on the relationship between a function or a use and an angular size characteristic.