  We prove a kind of "almost all symmetry" result for the Liouville function
$\lambda(n):=(-1)^{\Omega(n)}$, giving non-trivial bounds for its "symmetry
integral", say $I_{\lambda}(N,h)$ : we get $I_{\lambda}(N,h)\ll
NhL^3+Nh^{21/20}$, with $L:=\log N$. We also give similar results for other
related arithmetic functions, like the M\"{o}bius function $\mu(n)$
($=\lambda(n)$ on square-free $n$).
