what does jack u mean?

<use xlink:href="/assets-global/icons/svg-sprite.svg?v=2022-06-29-194711-0c1c97f-027248#ico_plus"> <use xlink:href="/assets-global/icons/svg-sprite.svg?v=2022-06-29-194711-0c1c97f-027248#ico_minus">

<use xlink:href="/assets-global/icons/svg-sprite.svg?v=2022-06-29-194711-0c1c97f-027248#ico_plus"> <use xlink:href="/assets-global/icons/svg-sprite.svg?v=2022-06-29-194711-0c1c97f-027248#ico_minus">

<use xlink:href="/assets-global/icons/svg-sprite.svg?v=2022-06-29-194711-0c1c97f-027248#ico_plus"> <use xlink:href="/assets-global/icons/svg-sprite.svg?v=2022-06-29-194711-0c1c97f-027248#ico_minus">

<use xlink:href="/assets-global/icons/svg-sprite.svg?v=2022-06-29-194711-0c1c97f-027248#ico_plus"> <use xlink:href="/assets-global/icons/svg-sprite.svg?v=2022-06-29-194711-0c1c97f-027248#ico_minus">