yes, no*
shows negative or positive values for dimensions.
no - dimension values appear positive; if you enter a negative value, the system creates the geometry to the opposite side.
yes - if the dimension you modify is negative, and if you enter a negative value, the system creates the geometry to the same
side (with the exception of dimensions created with respect to coordinate systems and datum point offsets - these dimensions
display the negative/positive value even if this option is set to no).