xxxxxxxxxx
<button mat-button *ngIf="item.value.view" matSuffix mat-icon-button aria-label="Clear" (click)="clear(i, j)">
<mat-icon>close</mat-icon>
</button>
xxxxxxxxxx
for more information about icons list
https://www.angularjswiki.com/angular/angular-material-icons-list-mat-icon-list/