The measurements of hadron and lepton-pair production cross sections and
leptonic forward-backward asymmetries performed with the L3 detector at
centre-of-mass energies between 130 GeV and 209 GeV are used to search
for new physics phenomena such as: 
contact interactions, exchange of virtual leptoquarks and Z' bosons,
effects of low scale gravity and TeV strings in models of quantum gravity
with large extra dimensions. No evidence for these phenomena is found and
new preliminary limits on their parameters are set.