Cetbang (originally known as bedil, also known as warastra or meriam coak) were cannons produced and used by the Majapahit Empire (1293–1527) and other kingdoms in the Indonesian archipelago. There are 2 main types of cetbang: the eastern-style cetbang which looks like a Chinese cannon and is loaded from the front, and the western-style cetbang which is shaped like a Turkish and Portuguese cannon, loaded from the back.

The word "cetbang" is not found in old Javanese, it probably comes from the Chinese word chongtong (銃筒), which also influenced the Korean word 총통(chongtong). The term "meriam coak" is from the Betawi language, it means "hollow cannon", referring to the breech. It is also simply referred to as coak.

Cetbang in old Javanese is known as bedil. It is also called a warastra, which is synonymous with bedil. Warastra is an old Javanese word, it means magic arrow, powerful arrow, awesome arrow, or superior arrow.

In Java, the term for cannon is called bedil, but this term may refer to various types of firearms and gunpowder weapon, from small pistol to large siege guns. The term bedil comes from wedil (or wediyal) and wediluppu (or wediyuppu) in the Tamil language. In its original form, these words refer to gunpowder blast and saltpeter, respectively. But after being absorbed into bedil in the Malay language, and in a number of other cultures in the archipelago, that Tamil vocabulary is used to refer to all types of weapons that use gunpowder. In Javanese and Balinese the term bedil and bedhil is known, in Sundanese the term is bedil, in Batak it is known as bodil, in Makasarese, badili, in Buginese, balili, in Dayak language, badil, in Tagalog, baril, in Bisayan, bádil, in Bikol languages, badil, and Malay people call it badel or bedil.

There are 2 main types of cetbang:

Its predecessors were brought by the Mongol-Chinese troops to Java, so they resembled Chinese cannons and hand cannons. Eastern-style cetbangs were mostly made of bronze and were front-loaded cannons. It fires arrow-like projectiles, but round bullets and co-viative projectiles can also be used. These arrows can be solid-tipped without explosives, or with explosives and incendiary materials placed behind the tip. Near the rear, there is a combustion chamber or room, which refers to the bulging part near the rear of the gun, where the gunpowder is placed. The cetbang is mounted on a fixed mount, or as a hand cannon mounted on the end of a pole. There is a tube-like section on the back of the cannon. In the hand cannon-type cetbang, this tube is used as a socket for a pole. The arrow-throwing cetbang would have been useful in naval combat, especially as a weapon used against ships (mounted under the bow gun shield or apilan), and also in a siege, because of its projectile ability to explode and as incendiary material.

The western-style cetbang was derived from the Turkish prangi cannon that came to the archipelago after 1460 CE. Just like prangi, this cetbang is a breech-loading swivel gun made of bronze or iron, firing single rounds or scatter shots (a large number of small bullets). In order to achieve a high firing rate, 5 chambers can be alternately reloaded.

For the rear-loading cetbang, the smallest may be about 60 cm (24 in) long, and the largest about 2.2 m (7 ft 3 in). Their calibers range from 22 to 70 cm (8.7 to 27.6 in). They are light, mobile cannons, most of them can be carried and shot by one man, but they are not fired from the shoulder like a bazooka because the high recoil force could break human bones. These gun are mounted on swivel yoke (called cagak), the spike is fitted into holes or sockets in the bulwarks of a ship or the ramparts of a fort. A tiller of wood is inserted to the back of the cannon with rattan, to enable it to be trained and aimed.