Lesson 5.3: Arrows
Arrow symbols consist of a shaft and a barbed tip. The barbed tip can point in any direction and be full, half, curved or directionless. The shaft can take many forms (solid, double, curved, dotted, etc.). This lesson will look at simple arrows with a full barb and a straight horizontal shaft.
An arrow symbol in UEB is formed with the opening arrow indicator, dots one two five six, and a closing symbol with dots arranged in a consistent pattern to indicate the direction of the arrow. A grade 1 indicator must be used with the opening arrow indicator since it also has a grade 2 meaning unless grade 1 mode has already been set.
Additional symbols are used to indicate the type of barbed tip and its direction when the arrow shape has unusual tips or shafts. In the case of the common bidirectional arrow, the barbs pointing in both directions must be shown with signs for each. Dots two four five six are used for the full barb counter to the line of direction and dots one two three five indicate the full barb in the line of direction. The line of direction is deemed to be to the right when the tips point in both directions. These symbols are placed between the arrow opening and terminating symbols. The signs are transcribed in logical order: opening arrow indicator, barb counter to the line of direction, barb in the line of direction, and closing indicator for right-pointing arrow. The closing indicator for right pointing arrow is dots one three five.
It is important to note that the arrow indicator is not used when the simple right-pointing arrow is the only modifier above or below an item. There are separate UEB symbols for simple right pointing arrow over previous item and simple right pointing arrow under previous item. These symbols will be discussed in later lessons. Additional symbols for arrows with unusual shafts and a standard barbed tip or arrows with unusual tips can be found in Guidelines for Technical Materials §13.
Example 1(simple right-pointing horizontal arrow)
Example 2(simple left-pointing horizontal arrow)
Example 3(common horizontal bidirectional arrow)