[1] It's interesting to note that Egils saga shows the kesja being thrown like a javelin or spear, and describes it in detail, calling it also a "mail-piercer" (brynþvarar): The kesja would thus have a blade around 90 cm in length with a diamond cross-section at the end, and an additional spike attached to the socket, whose placement and purpose is not explained.
The length of the weapons' shaft is unclear, but was either shoulder-height, or long enough that a man reaching up could still touch the socket.
The krókspjót resembled a regular spear, except that it had two lugs or "wings" attached at the bottom of the spearhead, somewhat like a boar-spear.
It is possible that halberds and bills were not part of Viking funerary customs, as opposed to other weapons that have been found in graves.
Bills have been found in Frankish graves from the Merovingian period, which predates the Viking Age; but their use by the Scandinavians is not attested and, if existent, seemed to have been rare.