It means that the tip is lead-free compatible.
During the establishment of lead-free standards and symbols by RoHs, a "#" symbol was put on the packages of some Hakko tips before the implementation of new warning label indicating lead-free:
Tips with "#" mark are: T7 series, 900 series, Dash and Presto tips from November of 2004 to January of 2005.
The "#" mark has now been replaced by RoHs compliance symbol
and the Hakko green project symbol.
To learn more about Hakko lead-free products and Hakko green project, please visit https://www.hakkousa.com/lead-free/
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