I tried to make the symbols as shown in the picture but it's bigger than the other content. How can I fix it? I would be grateful if anyone could help me in this regard.As shown in the picture

\usepackage{amsmath, amssymb, amsthm,mathtools}  % Mathematical symbols and environments
\usepackage{tikz} % For drawing boxes
% Define the command to circle and fill 
  \tikz[baseline=(char.base)]\node[fill=black, text=white, draw, circle, inner sep=0.0pt, minimum size=0.0em, line width=0.0pt] (char) {#1};%
%define star
% Define the custom command
If $a \text{\filledcircledopenbigstar}b$ is defined as $2 a-b^{a}$, what value is associated with $(5\text{\filledcircledopenbigstar} 2) -(3\text{\filledcircledopenbigstar}2)$?

1 Answer 1


You can use pifont package: the symbols are \ding{74} and \ding{95}.

enter image description here

A possible MWE:


If $a \cost b$ is defined as $2a-b^a$, what value is associated with $(5 \cost 2)$ 
$a \blst b$

enter image description here

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