It is aligned along a northeast-to-southwest axis, a deliberate orientation that recurs across prehistoric standing stones throughout Ireland and is generally thought to reflect astronomical, ritual, or territorial concerns, though the exact meaning remains genuinely unresolved. The stone itself is relatively slender, measuring 1.3 metres in length and only 0.2 metres in width, giving it a blade-like profile that catches the light differently depending on the angle of approach.

Standing stones, sometimes called galláin in Irish, are among the most widespread and least understood monuments in the Irish landscape. They date broadly to the Bronze Age, roughly 2500 to 500 BC, though precise dating of individual examples is rarely possible without associated finds or excavation. The Killacoosane stone sits in open pasture with commanding views to the south, a siting that may have been entirely intentional. Elevated or open positions with long sightlines are common among standing stones across West Cork, a region that contains a notable concentration of prehistoric monuments including stone circles, boulder burials, and wedge tombs. Whether this particular stone once formed part of a wider ceremonial landscape, marked a boundary, or served some other function entirely is not recorded.