Freezing Charm

"...immobilising two pixies at once with a clever Freezing Charm and stuffing them back into their cage"

— Hermione Granger's use of the charm in her Defence Against the Dark Arts class^[src]

The Freezing Charm (Immobulus^[1]) is a spell which immobilises living targets.^[2] It can also, according to Horace Slughorn, be used to disable Muggle burglar alarms.^[3]

Known uses

This spell is covered in The Standard Book of Spells, Grade 2 by Miranda Goshawk.
Hermione Granger used this spell on a pair of pixies in her second year after her teacher tried and failed to subdue them with the incantation Peskipiksi Pesternomi.
Professor Remus Lupin used it in 1993 on the Hogwarts Whomping Willow.
Harry Potter used it in 1994 to liberate himself from some attacking Grindylows.
Horace Slughorn used this charm throughout 1996 to freeze the burglar alarms of Muggle houses he stayed in due to Death Eater attacks.
This may be the spell Kingsley Shacklebolt used non-verbally during the Battle of Hogwarts.^[4]

The incantation is derived from Latin immobilis meaning "immobile, unmoving".

In the second film, Hermione freezes all of the pixies at the same time instead of just two.
Despite the books and video games giving no incantation, the word is shown to be Immobulus in the film.
In Harry Potter for Kinect Harry ane Voldemort can use this spell against each other during the final battle during Voldemort's Last Stand as they engage in a normal duel.

The Standard Book of Spells

Grade 1 · Grade 2 · Grade 3 · Grade 4 · Grade 5 · Grade 6 · Grade 7
Charms included in the series: Dancing Feet Spell (Tarantallegra) · Disarming Charm (Expelliarmus) · Engorgement Charm (Engorgio) · Fire-Making Spell (Incendio) · Freezing Charm (Immobulus) · General Counter-Spell (Finite Incantatem) · Levitation Charm (Wingardium Leviosa) · Locking Spell (Colloportus) · Memory Charm (Obliviate) · Mending Charm (Reparo) · Nonverbal spell · Severing Charm (Diffindo) · Skurge Charm (Skurge) · Softening Charm (Spongify) · Substantive Charm · Summoning Charm (Accio) · Tickling Charm (Rictusempra) · Unlocking Charm (Alohomora) · Wand-Lighting Charm (Lumos)