For example Grapho-therapy often addresses the letter t:
The higher the t-bar is crossed on the t-stem, the higher a persons goals and self-esteem. This is one of the earliest and most basic things every graphologist learns.
There are over 30 different character traits to the letter t, depending on how it is written.

This stroke indicates, a person is 'Aggressive'

This stroke indicates, a person is 'Anti social - Lack of Trust'

This stroke indicates, a person is 'Clannish - 1/2 Close Friends'

This stroke indicates, a person is 'Exaggerated Imagination & Sex Drive'

This stroke indicates, a person is 'Loner / Independent'

This stroke indicates, a person is 'Loner with Lack of Drive'

This stroke indicates, a person is 'Healthy - Normal Physical Drive'

This stroke indicates, a person is 'Sexually Frustrated & Open for Any Thing'

This stroke indicates, a person is 'Incomplete Sex Life - Frustration'

This stroke indicates, a person is 'Slow to Trust - Socially Selective'