packages/overlays/IconPackCircularSystemUIOverlay/res/drawable/ic_hotspot.xml

<!--
/**
 * Copyright (c) 2019, The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 * * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
-->
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    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24"
    android:viewportHeight="24">

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        android:pathData="M 0 0 H 24 V 24 H 0 V 0 Z" />
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        android:fillColor="#000000"
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        android:fillColor="#000000"
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        android:fillColor="#000000"
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</vector>