$tokens-icon-sizes: (

"3": 3,
"4": 4,
"5": 5,
"6": 6,
"7": 7,
"8": 8,
"9": 9,

);

$icon-inline-size-magic-number: 1em;

.usa-icon {

display: inline-block;
fill: currentColor;
height: $icon-inline-size-magic-number;
position: relative;
width: $icon-inline-size-magic-number;

}

@each $token, $units in $tokens-icon-sizes {

.usa-icon--size-#{$units} {
  @include u-square($units);
}

}