This will depend on how you have specified things in the serial module. Most likely the number is being transmitted as a 4 byte floating point number which is the most efficient way to send a decimal number. If you just want a single text integer you can try
\i[my_variable]
but this could be 1 byte or 3 bytes (i.e. 5 degrees or 324 degrees). Note the 'i' between the \ and [.
Or you can try
\w[my_variable]
which would send a 2 integer byte with the first byte being the higher value, i.e. byte * 256.
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