Display text on masked subsystem icon
disp(text) disp(text, 'texmode', 'on')
disp( displays text)text centered
on the block icon. text is any MATLAB® expression
that evaluates to a string.
disp(text, 'texmode', 'on') allows you to use
TeX formatting commands in text. The TeX formatting commands
in turn allow you to include symbols and Greek letters in icon text. See Interpreter for information on the TeX
formatting commands supported by Simulink® software.
The following command
disp('{\itEquation:} \alpha^2 + \beta^2 \rightarrow \gamma^2,
\chi, \phi_3 = {\bfcool}', 'texmode','on')
draws the equation that appears on this masked block icon.

fprintf | port_label | text