most spears have edges which could be used for slashing*. some pole arms have oval or octagonal/rectangular poles for orientation or even grip straps. halberds, pole axes, etc... lances and javalins didn't need orientation. some are just round, possibly as an expense saver.
* - vikings had a 'hewing spear'.
i find with my round handled dha/darb that as i hold the scabbard in one hand and the grip in the other, they orient themselves as i un-scabbard it. i do prefer oval tho.
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