US Patent 10388174 Writing instrument teaching system

A writing instrument comprises an elongated barrel having a first end, a second end and a plurality of sides including at least three sides, each side having data printed along its length at uniform spacing increments from the first end, the data on any two sides that share the same distance from the first end are computationally related to the data on another side that shares the same distance from the first end. The data includes at least one of a numerical data or a phonic alphabet. The numerical data on a first side and a third side is linked to a sign that associated with an arrow respectively to indicate the direction to which the writing instrument should be rotated to signify the computation relation. Thus, the elongated barrel defines a triangular shaped writing instrument that allows a user to learn the computation relation between the data.