What is this sign called with the arrow pointing up?

[Ashutosh Thakur]

Hi Alex,

The arrow pointing up is the part of the block icon which you are leveraging in the model.

Answer 1

[Vinay]

Hii Alex,

The block used in the model is the "Hit Crossing" block, which can be found under Simulink > Discontinuities > Hit Crossing. This block is designed to detect when the input signal reaches the specified Hit Crossing offset parameter value, in the direction defined by the Hit Crossing direction property.

The block's symbol was updated in the MATLAB R2016b release.