Does immigrant visa allows multiple entry?

[libra14]

My follow-to-join family recently approved their employment based immigrant visa abroad. The visa expiry date is 5 months from the date of issue.

For some reason they needed to be in home country around Feb/March 2023.

Assuming they travel to USA now & have to go back before they receive their physical green card, can they use their immigrant visa again to re-enter?

[newacct]

No. Immigrant visas are single use. But at the moment of entry, the immigrant visa automatically turns into an I-551 (equivalent to a green card, which is also an I-551) valid until 1 year after the date of entry. They can use this immigrant-visa-turned-I-551 to enter the US for as many times as they want during that 1 year after their initial entry. The immigrant visa's expiration date no longer matters after it was used to enter the first time (since it's single use anyway).