However, many of Orlando's fans were quick to point out that the tattoo is wrong - and actually spells "Frynn" due to a single dot being missing from the second letter.
However, some eagle-eyed fans spotted that something was off with the sequence of dots and dashes.
Bloom and Kerr tied the knot in 2010 and welcomed their son, Flynn, the following year.
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Apparently, when you decode the dashes and dots, it reads "Frynn", not "Flynn". Teasing his followers about the meaning of the design, which also features Flynn's date and time of birth, the star wrote: "New #tattoo can you guess who?"
Hungarian artist Balazs Bercsenyi, pictured in the photo with Bloom, created the tattoo for the "Lord of the Rings" star. Bloom shares his son Flynn with his ex-wife, Miranda Kerr.
"A attractive reminder for @orlandobloom of his son", he captioned the picture. They divorced in 2013.
"I always was like, 'Listen, we're gonna be in each other's lives for the rest of each other's lives. Miranda the supermodel and Katy Perry as his [future stepmum]", Bloom said, before playful adding, "I'm just like, 'We need to get him in therapy right now'".