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If you mean THE cross, as in the christian cross, then no. That cross was used as a tool for punishment, which found it's usage in the Roman Republic and Empire. Given the fact that Rome waged war against the Germanic tribes, it would be no wonder that many members of those tribes found their painful death on the cross too, it would be bad to use it as a symbol. Even if you take into context it's symbolism in christianity, that is an israeli man being killed on it by the Romans in Israel, then still it is a disregard to all forms of pre-christian Germanic traditions and heretige, which existed long before the Germanic, and all other people in Europe, were submitted to middle eastern mythology.
If you tho mean some variation of a pre-christian cross, then maybe yes, that could fit.
And yes, Europa Universalis is a great history, geography and heraldics teacher indeed.
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