What is the triangular and rectangle block symbols in this model, from the two pictures?

I am presently working on simscape to build a TEG module and i am making reference to a paper. I need to build this model in simscape but i don't seem to find those two blocks in simscape or simulink. Please does anyone know what these blocks are and how i can locate them? ***Pictures attached.

Answer 1

[Rohit Pappu]

The triangular block is a Gain Block while the Temperature Sensor could be a subsystem. As an alternative option, Ideal Temperature Sensor could be used

[Ibukunolu Oladunjoye]

@Rohit Pappu Thank you Rohit. With regards to the \triangular block, I am just wondering that if we say its a Gain block, its meant to be in numeric value not letters. I don't think there is the possibility of writing letters in a Gain block. Also, the Temparature sensor being a subsystem is very confusing because they didn't specify what is in the subsystem in the paper i got that.

[Rohit Pappu]

The Gain block can take up values pertaining to variables stored in the workspace. So, in the above case Alfa_teg must be a workplace variable