A Frenum Ladder, also known as a Jacob's Ladder, consists of a series of frenum piercing

Frenum piercing

A frenulum piercing is a type of body piercing located on the underside of the shaft of the penis. A series of parallel frenulum piercings is known as a frenum ladder. A frenum ladder may be extended to include lorum piercings, hafada piercings and guiche piercings.-Placement:Frenum piercings are...

s often extending from below the head of the penis and as far as the base of the shaft of the penis.

Sometimes, a frenum ladder will be accompanied by a hafada ladder

Hafada piercing

A hafada piercing is a surface piercing located anywhere on the skin of the scrotum. This piercing does not penetrate deep into the scrotum, and due to the looseness and flexibility of the skin in that area, does not migrate or reject as much as many other surface piercings...

 and/or a guiche ladder. Due to the relatively easy healing of these piercings it is not uncommon for several, or even all of them to be performed at the same time.

Less common is a lorum ladder which consists of a series of lorum

Lorum

A lorum is a male genital piercing, placed horizontally on the underside of the penis at its base, where the penis meets the scrotum. The word "lorum" is a portmanteau of the words "low" and "frenum", so named because it is essentially a very low-placed frenum piercing.Much like the frenum piercing...

piercings.